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Depends on your budget.
High end (£700-£1100+) you're looking at GTX 2080 or 2080Ti.
Mid range (£370-£500) would be GTX 2070/S or AMD 5700XT
Low end (£200-£250 for 60+FPS) GTX 1660S
The monitor is Freesync compatible, I've read the latest Nvidia cards can do this. Anyone run Nvidia and Freesync? Any issues?